Voltage endurance of magnet wire films — II

The effects of sustained voltages on magnet wire films has been the subject of a previous paper. The continuing results of this work, particularly at lower voltages, are reported here. The tests have been expanded to include the newer Class H film constructions, not generally available when the earlier tests were started. Further work is also described on the effects of aging in a nitrogen atmosphere and in air at high humidity both, at an elevated temperature.